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Phase Transitions
A Multinational Journal
Volume 80, 2007 - Issue 6-7: Special Issue of Phase Transitions dedicated to Professor Jerzy A. Janik from the H. Niewodniczań ski Institute of Nuclear Physics, Polish Academy of Sciences, Poland, on his eightieth birthday
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Original Articles

Dielectric relaxation studies of 4-(2-hexyloxyethoxy)4′-cyanobiphenyl (6O2OCB) enclosed in SiO2 nanopores

M. Massalska-Arodź The H. Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, PolandCorrespondence[email protected]
,
J. Krawczyk The H. Niewodniczański Institute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland
,
B. Procyk Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30, 30-059 Kraków, Poland
&
F. Kremer Department of Physics, University of Leipzig, D-04103 Leipzig, Germany
Pages 687-695 | Received 19 Dec 2006, Accepted 18 Feb 2007, Published online: 04 Dec 2010
 
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Abstract

Dielectric relaxation of 4-(2-hexyloxyethoxy)4′-cyanobiphenyl (6O2OCB) enclosed in porous SiO2 matrix is presented and compared with the results of the substance in bulk. It was found that molecular reorientations in pores are faster than in bulk. The evidence of the isotropic–smectic phase transition is shown. Dynamics observed in isotropic liquid is of non-Arrhenius type while in smectic phase is of Arrhenius one. Comparison with the results concerning the substance enclosed in ZrO2 porous matrix is added.

Acknowledgements

The authors would like to thank Prof R. Dąbrowski (Military University of Technology, Warsaw, Poland) for 6O2OCB substance and Dr V. Gorbatchev and Dr L. Hartmann for valuable help during measurements. The work was partially supported by the grant No. 1 P03B 060 26 of the State Committee for Scientific Research (KBN).

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